MBP won't go to sleep when closing lid...

...but it would go to sleep if I select that manually.
Is that a mechanical problem or software related ? I repaired permissions several times and reset PMU but nothing changed.
Any ideas ?

OK, I forgot to mention... maybe this was important...
Same MBP with freshly installed SL, no additional software, no system settings changed, no software running, wireless and BT off, same story... Sleep works with every method but closing the lid. Kinda makes me think of a hardware issue.
I'm expecting a "take it to Apple" answer very soon, but I'm just hoping someone had the same problem before and worked it out somehow, cause I can't figure it out
Thank you for the answer though...

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